FIRS 5.2.0 fork · GPL v2

FIRS Forked: Oil Town

A single-economy FIRS fork for OpenTTD by TepacheLoco. Everything revolves around oil and gas: pump it, refine it, crack it, ship it, burn it.

Install Supply chain GitHub

What Oil Town is

Oil Town is a single-economy fork of FIRS. It keeps FIRS's upstream industries that make sense for an oil world and adds a full petrochemistry chain on top: cracking, plastics, fertiliser, bitumen, lubricants, fracking, treated water, and export trading. Sub-tropical climate is not necessary but recommended.

The hook: a five-tier chain where every output feeds something further downstream, with a couple of feedback loops tying the whole thing together.

The supply chain

Filter by cargo
1

Extraction

  • Offshore Oil Rigoff-shore
    engineering supplies
    crude oil passengers
  • Onshore Oil Wells
    engineering supplies
    crude oil raw gas
  • Natural Gas Well
    engineering supplies
    raw gas
  • Coal Mine
    engineering supplies
    coal
  • Desalination Plantcoastal
    engineering supplies
    treated water
  • Fracking Wellrequires fluid
    fracking fluid
    raw gas condensate
2

Primary processing

  • Oil Refinery
    crude oil condensate
    light oil heavy oil naphtha refinery gas
  • Gas Processing Plant
    raw gas refinery gas
    LNG LPG sulphur condensate
  • Coking Plant
    coal
    coke coal tar
3

Petrochemistry

  • Cracking Plant
    naphtha refinery gas coal tar
    ethylene chemicals
  • Chemical Plantgated
    ethylene sulphur treated water
    chemicals
  • Fracking Fluid Plantgated
    chemicals treated water
    fracking fluid
4

Processing & production

  • Lubricants Plantgated
    heavy oil LNG
    lubricants
  • Bitumen Plantgated
    heavy oil coke
    bitumen
  • Plastics Plantgated
    ethylene chemicals
    plastics
  • Fertiliser Plantgated
    LNG sulphur chemicals
    fertiliser
  • Petroleum Refinerygated
    light oil chemicals lubricants
    petroleum fuels
  • Engineering Supplies Plantgated
    lubricants bitumen coke plastics coal tar
    engineering supplies
5

Exports

  • Fuel Terminalcoastal
    crude oil light oil heavy oil petroleum fuels LNG LPG
  • Trading Portcoastal
    chemicals plastics fertiliser bitumen coal coke lubricants
    food
  • Power Station
    coal heavy oil LNG
  • Petrol Stationin-town
    petroleum fuels
  • Water Towerin-town
    treated water

Features

Engineering supplies

As in standard FIRS — deliver them to a tier-1 extractive for the usual production boost. The plant sits in tier 4, so the loop closes on itself.

Fracking needs fluid

Unlike the other extractives, a fracking well requires fracking fluid deliveries to operate — no fluid, no gas. It rewards the long chain you built to feed it (chemicals → fracking fluid → well) with a hefty yield of both gas and condensate.

Treated water for towns

Treated water has the same town-delivery effect food has in other FIRS economies: haul it to a water tower and you'll see the usual growth / happiness bonus kick in.

Gated production

Most tier-3 and tier-4 plants halt production unless every required input has been delivered within the last three minutes — deliver the missing cargo and the next truck through kicks off a fresh batch.

Cargo-value spread

Cargos split into three stability tiers: stable cargos (oil, sulphur, fertiliser, plastics, bitumen, etc.) barely lose value over distance, medium decays at the normal rate, and volatile cargos (ethylene, naphtha) reward short, express routes.

Install

Published to BaNaNaS, OpenTTD's online content service — no manual file handling required.

  1. Open the online content browser

    From the OpenTTD main menu, click Online Content.

  2. Find the package

    Filter by NewGRF and search for FIRS Forked: Oil Town. Tick it and click Download.

  3. Enable it and start a new game

    Start a new game. In the NewGRF settings, enable FIRS Forked: Oil Town. The economy parameter is fixed to Oil Town — no configuration needed. Sub-tropical climate is not necessary but recommended.

Prefer to build from source? Clone the GitHub repo and follow the build instructions in the README.

Credits & license

Based on FIRS by andythenorth and contributors — see the upstream repository for the full list. All sprite art, build tooling, and NewGRF templating is from upstream FIRS. This fork reuses existing FIRS sprite sheets for its new industries rather than producing new art.

Licensed under GPL v2. See CHANGES.md in the repo root for the fork-diff required by the GPL.